The ''KDE Workspace'' group (aka ''Plasma'') is defined as those KDE Modules that are needed to run a workspace, such as the Desktop or Netbook. This group is not needed to run a KDE Application under another workspace such as Gnome or Windows.

The ''KDE Applications'' group is defined as those KDE modules built on the KDE Development Platform that are hosted by the KDE infrastructure and are released as part of the regular KDE Release Cycle, i.e. they are part of the '''KDE SC'''.

The ''KDE Extragear'' group is defined as those applications built on the KDE Development Platform that are hosted by the KDE infrastructure and have a stable release but are not part of a KDE Module and are not released as part of the regular KDE Release Cycle, i.e. they are not part of the '''KDE SC'''.

The '''KDE Playground''' group is defined as those applications built on the KDE Development Platform that are hosted by the KDE infrastructure but have not yet had a stable release and may never be released.